My #2 and #4 cylinders are still giving me problems. Motor starts right up(on only 2 cyls, I think). I pull the #2 plug wire and engine doesn't stumble....same for #4.
I sprayed premix in the starboard carb throat(this carb feeds #2 and #4 cyls on the port bank) and the motor backfires(a loud "pop!"). I turned motor off and sprayed a little premix in both cylinders and reinstalled the plugs....restarted the motor with a loud "pop!" backfire.
What the heck could be causing this?